to replace self polishing copolymer (SPC) biocidal antifoulings with International Paint’s biocide-free silicone-based foul release coating, Intersleek 700, when the ships were docked successively through 2006 and 2007. Since then, detailed performance
analysis onboard one of the VLCCs, the Ramlah, has demonstrated significant fuel savings and emissions reductions resulting from the use of Intersleek 700, rather than the earlier SPC antifouling. Te analysis covered the whole docking period prior to the application of Intersleek 700 and the on-going performance since
the application of system. “The results demonstrate an overall 6.4% improvement in fuel efficiency, which translates into a saving of more than 6500tonnes, equivalent to around US$3.2 million at US$500 a tonne. Corresponding savings in greenhouse gas emissions mean that more than 20,000tonnes of CO2
have been
prevented from entering the atmosphere from this one vessel,” said John Willsher, Intersleek product manager. The data has been independently verified by vessel performance specialists, BMT, International points out. “Tese results are very important for us,”
added Mr Willsher. “Tey demonstrate that ship operators can not only benefit from substantial fuel savings but that the latest generation of foul release coatings can play a key role in shipping companies’ environmental strategies as they seek to reduce emissions.” There are many new coatings
technologies current ly under development, but some of these are quite complex and expensive. “Although they do offer benefits, Intersleek is relatively simple, available now and these results prove the positive impact it can have,” Mr Willsher concludes. SCRT
Tailoring coatings for FPSO conversions
In December 2010 FPSO P-57 started production from the Jubarte field offshore Brazil, following an extensive hull conversion project carried out from VLCC Island Accord in Singapore by Keppel. Te FPSO is being operated by SBM Offshore under a contract from Petrobras.
correct coating system for the external hull, water ballast and slop tanks. Tese highly corrosive environments are much harder to inspect on an FPSO than conventional ocean-going ships which can expect regular dry docking. Te expectations of owners and operators for FPSOs with regards to coating lifetime is high given that the asset lifetime is oſten expected to be up to 25 years and this means the selection of high performance coatings is required. For P-57, the parties decided to utilise International Paint’s
A Intershield 300
universal epoxy primer. The coating is formulated as a universal epoxy primer so that it can be used on many different areas of an FPSO. Te ‘excellent’ long term corrosion performance is attributed to it being a pure epoxy with 9% aluminium content. Indeed a key part of its formulation is the ability to provide excellent edge protection which is consistently an area
A range of coatings were supplied by International Paint for FPSO P-57 conversion.
Shiprepair and Conversion Technology 1st Quarter 2011 37
n important element of this, and indeed all FPSO conversion projects, is the selection of the
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